# United States tariff lines under HS 2922.21

> The United States tariff splits HS 2922.21 (amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof: Aminohydroxynaphthalenesulphonic acids and their salts) into 4 national lines: 2922.21.10.00 (1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts), 2922.21.25.00 (1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt), 2922.21.40.00 (products described in additional U.S. note 3 to section VI) and 2922.21.50.00 (other). The general (MFN) duty differs by line: 5.8% on 2922.21.10.00, free on 2922.21.25.00, 6.5% on 2922.21.40.00 and 6.5% on 2922.21.50.00.

Source: https://border.bot/countries/united-states/hs-codes/292221
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 29](https://border.bot/countries/united-states/hs-codes/29) / [2922.21](https://border.bot/countries/united-states/hs-codes/292221)

## Key facts

- HS subheading: [2922.21](https://border.bot/hs-codes/292221)
- National lines: 4
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 29: Organic chemicals

## United States lines under 2922.21

The United States tariff splits HS 2922.21 (amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof: Aminohydroxynaphthalenesulphonic acids and their salts) into 4 national lines: 2922.21.10.00 (1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts), 2922.21.25.00 (1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt), 2922.21.40.00 (products described in additional U.S. note 3 to section VI) and 2922.21.50.00 (other).

The general (MFN) duty differs by line: 5.8% on 2922.21.10.00, free on 2922.21.25.00, 6.5% on 2922.21.40.00 and 6.5% on 2922.21.50.00.

- [2922.21.10.00](https://border.bot/countries/united-states/hs-codes/2922211000) Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, Aminohydroxynaphthalenesulfonic acids and their salts, 1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts. Duty (MFN): 5.8%
- [2922.21.25.00](https://border.bot/countries/united-states/hs-codes/2922212500) Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, Aminohydroxynaphthalenesulfonic acids and their salts, 1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt. Duty (MFN): free
- [2922.21.40.00](https://border.bot/countries/united-states/hs-codes/2922214000) Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, Aminohydroxynaphthalenesulfonic acids and their salts, Other, Products described in additional U.S. note 3 to section VI. Duty (MFN): 6.5%
- [2922.21.50.00](https://border.bot/countries/united-states/hs-codes/2922215000) Amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof, Aminohydroxynaphthalenesulfonic acids and their salts, Other, Other. Duty (MFN): 6.5%

## In other countries

No other national tariff on border.bot has live lines under 2922.21 yet.

- [The Harmonized System text for 2922.21](https://border.bot/hs-codes/292221)

- Previous subheading: [2922.19](https://border.bot/countries/united-states/hs-codes/292219) Other
- Next subheading: [2922.29](https://border.bot/countries/united-states/hs-codes/292229) Other

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 2922.21?

The United States tariff splits HS 2922.21 (amino-naphthols and other amino-phenols, other than those containing more than one kind of oxygen function, their ethers and esters; salts thereof: Aminohydroxynaphthalenesulphonic acids and their salts) into 4 national lines: 2922.21.10.00 (1-Amino-8-hydroxy-3,6-naphthalenedisulfonic acid; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid (Chicago acid); 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, potassium salt; 4-Amino-5-hydroxy-1,3-naphthalenedisulfonic acid, sodium salt; 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, monosodium salt (H acid, monosodium salt); 4-Amino-5-hydroxy-2,7-naphthalenedisulfonic acid, potassium salt (H acid, monopotassium salt); 4-Amino-3-hydroxy-1-naphthalenesulfonic acid; 6-Amino-1-naphthol-3-sulfonic acid and its salts; and 8-Amino-1-naphthol-5-sulfonic acid and its salts), 2922.21.25.00 (1-Amino-8-hydroxy-4,6-naphthalenedisulfonic acid, monosodium salt), 2922.21.40.00 (products described in additional U.S. note 3 to section VI) and 2922.21.50.00 (other).

### What is the duty on HS 2922.21 in the United States?

The general (MFN) duty differs by line: 5.8% on 2922.21.10.00, free on 2922.21.25.00, 6.5% on 2922.21.40.00 and 6.5% on 2922.21.50.00.

## Sources and updates

The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.

This page was last updated on 9 October 2026.

Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/292221.json